Refillable cartridge-fuse.



B. B. MALLORY. EFILLABLE CARTRIDGE FUSE. APPLICATION FILED APR.3,1911

Patented June 6, 1911.

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15 $1 rm-"Ii INVENTOR.

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WITNESSES Eric nnwama B. matron, or .WILKINSBUBG, rannsrnvam.

To all whom it may concern:

Be it known that I, EDWARD B. MALLORY, a citizen of the United States, residing at Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a certain new and useful Improvement in Refillable Cartridge-Fuses, of which the following is a specificatio -My invention pertains to refillable cartridge-fuses of the electrical class which are capable of being recharged when the fuse burns out, and which can be repeatedly used by simply inserting a new fuse.

The primary object of my'invention involves the construction of a rechargeable cartridge-fuse in which the vital and necessary function of good electrical and me- 4 ehanical contact is obtained between the removable fuse and end pieces which serve to securely retain the fuse in'position without cutting or distorting the same.

Still another object entering intothe construction of my invention is its ready adaptation for the use of either round or strap fuses toaccommodate either high or low current.

In the accompanying drawing I have illustrated the detail construction of my invention wherein I show its adaptation to both the round and strap fuses, Figure 1" being a longitudinal and part sectional view of a cartridge equipped with a round fuse; Fig. 2 shows a similar view of a cartridge adapted for a strap fuse, illustrating two methods of c tacting the removable end pieces with th, fuse; Fig. 3 is a top plan view of the round fuse retaining plug member shown in Fig. 1, and Fig. ishows aside view of the same member; Fig. 5 is a top plan view of the strap fuse retaining plug member shown on the right ofFig. 2,-and Fig, 6 shows a side View of the same; Fig. 7 is a side view of the modified form, of strap fuse retaining plug-shown at the left side of Fig. 2; Fig. 8 is a vertical section of the blade carrying and contacting member .shown at the right in Fig. 2, and Fig. 9 is a Specification of Letters Patent. Application filcdhpril 3, 1911.

REFILLABLE CARTMDGE-FUSE.

Patented June 6, 1911. Serial 110. 618,687.

body portion, which is-const'ructed of any suitablenon-conducting material, and having exteriorly threaded end portions.

For retaining the round fuse 2, shown in Fig. '1, I prefer utilizing the form of securing plug shown in Fig. 3, and designated by the numeral 3. This said member is provided with a central aperture 4:, for the reception of the end sectlon of said fuse, said aperture being of a diameter corresponding with the size of the fuse, also with one or more projecting lug portions 5 surrounding said aperture, around which the fuse is wrapped, and of a height corresponding to the diameter of the fuse. On the opposite face of said plug 3 is a flanged portion 6, which, when the said member 3 is in its holding position, seats in notches 7 formed in the extreme end sections of the cartridge. This construction serves "as one means for locking said member 3 in holding position, and prevents it from turning in order that thefuse will not twist or become distorted when the final securing medium is brought into service.

An interiorly threaded cap member 8, provided with an interior'ly positioned counter-sunk portion 9 for receiving the lugs 5 when said cap is screwed into holding position, also with one or more vents 10,

=-serves as a positive contact piece with the fuse 2. The counter-sink 9, acting in conjunction'with the raised portions 5 formed on the plug 3, serves to limit the'amount of pressure which can be applied to the fuse 2, preventing cutting or mashing the fuse more than a pre-determined amount.

In the adaptation of my device for a strap fuse and blade contact incidental to its utility where, a high current is used, a slightly modified construction from thatjust descrihedis provided for in thef'orm shown in Fig. 2, wherein the same form of cartridge shell is used, but involving certain alterations in the fuse retaining members as follows: Inthis form I dispense with-the central aperture 4 in the securing lug 3, and bring the end of the strap i1. through a suitable sized notch 12 cut in or adjacent to the edge of the said member 3, after which" I bend said fuse and loo the artured end thereof over thecentra 0st 5, seating same on the bearing 13. his form of securing plug also carries the informed flan e 6 to engage in the It portion 7 o the shell. The blade preferred form shown in Fig. 7, or else the modified construction'shown in Fig. 11, engages against the said member 3 and serves, when held by the screw cap 15, to securely retain the end of said strap fuse and blades 16 in central alinement with each other.

At the left side of the shell, shown in Fig. 7, is illustrated a modified form of strap fuse securing means, which involves a groove 17 in the outer face.of the member 3, to receive the end of said strap fuse, on top of which will contact the flange portion 18 formed on the blade carrying member 14, said flange 18 being of such depth that when pressed into the groove 17 by the action of the screw sleeve 15, will only compress the fuse a predetermined amount when the surfaces 19 and 20 of the respective members engage with one another. The plug 3 having flange 6 and lugs 5, suitably arranged, acting in conjunction with notches 7 in the tube 1, provides a means for holding a fuse in fixed position, and enables the screw cap 8, when brought into engagement with the fuse, to brighten the contacting portions of the said fuse and cap, making it unnecessary to clean either the fuse ,or cap, other than by the means described, in order to insure good electrical contact.

It will "thus readily be apparent from the foregoing description that either form of' round or strap fusecan be securely held at both ends by the means shown, and when burned out can quickly be replaced by a new fuse and the cartridge be as good as new, also proyiding a means-forholding the fuse in positive contact with the end members, and preventing any cutting or mashing of said fuse re ardless of the amount of pressure applied to the binding members.

What I claim as new is:

1 In a cartridge-fuse of the class described the combination with a hollow insulating body having exteriorly threaded end portions, of plug members seated at the ends of said body; means formed on said plu cooperating with a recessin said body, or holding said plugs in fixed position; an aperture in said plugs for the reception of the fuse; lugs central y carried by the plugs; and screw cap members seated over and contartinigl with the. said lugs and fuse.

a cartridge-fuse of the class described the combination with a' hollow insulating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on said plugs for engagement in recesses in the ends of said body to act as a retainin means for said plugs; an a erture in sai plugs for the reception of t e fuse; lugs on said plugs to position said fuse for contact; and counter-sunk screw cap members seated over and contacting with said lugs and fuse.

3. In a cartridge-fuse of the class described the combination with a hollow insulating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on sa d plugs for engagement in suitable recesses in the ends of said body; an aperture in said plugs for the reception of the fuse; lugs on said plugs of a height corresponding w1th the diameter of the fuse; and screw cap members having a countersunk portion to receive said lugs and limit the pressure applied to the fuse.

4. In a cartridge-fuse of the class described the combination with a hollow insulating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged mea'ns formed on sa d plugs for engagement in suitable recesses n the ends of said body; an aperture in said plugs for the rece tion of the fuse; lugs on said plugs locate near the aperture of a height sufficient to prevent distortion ofthe fuse at the aperture; and counter-sunk screw cap members engaging over said lugs and contacting with the fuse.

5. In -a cartridge-fuse ofthe class described the combination with a, hollow insu lating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on sald plugs for engagement in suitable recesses in the ends of said body; an aperture in said plugs for the reception of the fuse; lugs on said plugs for positioning the fuse, of a height sufiicient to prevent distortion of said fuse where it emerges'from the aperture;

and counter-sunk screw cap members en-' gaging over said'lu s and contacting with the fuse adapted, w en being screwed into position, to cause a brightening of the fuse and cap at points of electrical contact.

6. In a cartridge-fuse of the lclam describedthe combination with a hollow insulating body havingexteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on said plugs for engagement in suitable recesses in the ends of said body; an aperture in said plu for the reception of the fuse; a centralized lugon the plugs for positioning the fuse; blade carrying elements for contact over the said lugsand against the fuse; and

screw cap members for engaggment over the 1 said elements and with the dy portion to press the said blade carrying elements against the fuse and obtain positive electrical contact. I

7. In a cartridge-fuse of the class described the combination with a hollow insw lating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on said plug for engagement in suitable recesses m ends of said body; a circumferentially disposed aperture in each plug for the reception of the fuse; a lug central of the plugs involving a bearing surface for positioning the fuse; blade carrying elements, involvlng an inner counter-sunk portion, for contact over said lugs and against the fuse; and screw cap members for engagement over the said elements and withthe body p0rtion to press the said blade carrying elements against the fuse and obtain positive electrical contact.

8. In a cartridge-fuse of the class described the combination with a hollow insulating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on said plugs for engagement in suitable recesses in the ends of said body; a circumferentially disposed aperture in each plug for the reception of the fuse; agroove in the outer face of each plug to receive the fuse; blade carrying elements involving an inner flange for contact in the groove portion of said plugs and against the fuse; and screw cap members for engagement over the said elements and with the body portion to press the blade carrying elements against the fuse and obtain positive electrical contact. a

9. In a cartridge-fuse of the class de scribed the combination with a hollow insulating body having exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on said plugs for engagement in suitable recesses in the ends of said body; a circumferentially disposed aperture in each plug for the recepgroove portion of said plugs and against the fuse, said flange and groove cooperating to limit the pressure against said fuse; and screw cap members for engagement over the blade carrying elements and with the body portion to press said elements against the fuse and obtain good elec trical contact, r v

10. In a cartridge-fuse of the class described the combination with a hollow insulating body having'exteriorly threaded end portions, of plug members seated at the ends of said body; flanged means formed on said plugs for engagement in suitable recesses in the ends of said body; a circumferentially disposed aperture in each plug for the re ception of the fuse; a groove in the outer face of each plug to receive the fuse; blade carrying elements involving an inner flange adapted to engage in the recesses at the ends of said body; also in the grooved portion of said plugs and against the fuse; and screw cap members for engagement over the blade carryingelements and with the body port-ion to press said elements against the fuse and obtain positive electrical contact.

In testimony whereof, I hereunto aflix my signature in the presence of two witnesses.

EDWARD B. MALLORY. 

